Journal
JOURNAL OF POWER SOURCES
Volume 483, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229188
Keywords
Lithium metal anodes; Metal-organic frameworks; Carbon nanofibers; In-situ growth; Nitrogen defects
Funding
- National Natural Science Foundation of China [21603030]
- Fundamental Research Funds for the Central Universities [2232018D3-02]
- Shanghai Scientific and Technological Innovation Project [18JC1410600]
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The study introduces a cobalt-enhanced nitrogen doped porous carbon nanofibers (PCNF-Co/N) with enhanced lithiophilic property for lithium metal anode, addressing issues of uncontrolled Li dendrite growth and volume expansion. The synergistic effect between Co and N defects boosts Li affinity and provides crucial roles in uniform plating of Li, while the porous structure formed by Zn sublimation offers buffer space for internal stress during Li plating/stripping.
Lithium (Li) metal is the most promising anode material for the next-generation high-energy density battery due to its high specific capacity and low redox potential. However, its practical applications is challenged by uncontrolled Li dendrite growth and volume expansion. In this work, we propose a cobalt-enhanced nitrogen doped porous carbon nanofibers (PCNF-Co/N) with an enhanced lithiophilic property. The Co/N co-doping is achieved through pyrolysis of self-assembled Co/Zn metal-organic framework (MOF) nanosheets on carbon nanofibers (CNF). The synergistic effect between the simultaneously introduced Co and N defects not only boosts the Li affinity of pyridinic and pyrrolic N but also transfers the graphitic N into lithiophilic, providing crucial roles for uniform plating of Li. Meanwhile, the porous structure formed by Zn sublimation provides sufficient buffer space for internal stress caused by Li plating/stripping. As a result, the PCNF-Co/N@Li anode delivers a long lifespan over 1400 h with a low voltage hysteresis. When paired with a LiFePO4 cathode, the full cell demonstrates decent cyclic stability and rate capability, demonstrating the capability of PCNF-Co/N in developing composite Li-metal anode with enhanced lithiophilicity and low internal stress.
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